If you've cleaned your MAP, then all that's left is the rear O2 sensor and the cat itself. Dealers change rear O2 sensors . . . mostly because that's one of the few pieces left in the puzzle. Then comes the cat . . . chi-ching! Honestly, I think Subaru uses the P0420 to increase dealer repair traffic.The Continental ContiProContact tire is the best overall tire for the 2015 Subaru Forester as of March 2015, according to tire review site BestReviews.com. The site also recommends...P0420 is VERY RARELY a failing cat. It is most commonly a failing oxygen sensor (front Subaru, rear any brand), vacuum leak, exhaust leak or what not. Search that code on the forums and you'll find plenty of info. Cats rarely fail without serious mechanical problems, I think your mechanic wants to give you an expensive repair bill.Visit me at: http://www.ericthecarguy.com/O2 Sensor Video: https://www.youtube.com/watch?v=NIzcztO-CCsDiscussion about this video: http://www.ericthecarguy...NinoS. 1104 posts · Joined 2014. #3 · Sep 8, 2020. I've used them before back when I put headers on my 03X - the fix works. You'll want to take a look at your 02 sensor and make sure you have space for a spacer (or maybe even if you can get it out), might need a 90 degree spacer (i'm not familiar with the SH forester).Welcome to the Subaru Outback Owners Forum, we have tons of information about your Subaru Outback, from a Subaru Outback Wiki to customer reviews. Show Less . Full Forum Listing. Explore Our Forums. Gen 5: 2015-2019 Problems & DIY Maintenance Gen 4: 2010-2014 Gen 6: 2020-present General Discussions.The OBD2 code P0420 is stored in memory when the PCM detects a low efficiency in the catalyst system. What symptoms may occur with this OBD II code? Usually, the only symptom is the CEL lit. The Check Engine Light will turn on after few driving cycles to alert the driver about the situation. But under some circumstances, the CEL will blink ...All O2 sensor and cat-related (P0420, P015A, P015B). It was the weekend, so I didn't go straight to the dealership, and then they went away after 5 cycles or so. ... Subaru definitely has some issues with the DI engines. My '04 FXT never had much of a problem with carbon buildup, though I did SeaFoam it myself a few times once it got up …How to diagnose code P0420 on a Subaru Legacy. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust flow ...May 23, 2011 · P0420 is VERY RARELY a failing cat. It is most commonly a failing oxygen sensor (front Subaru, rear any brand), vacuum leak, exhaust leak or what not. Search that code on the forums and you'll find plenty of info. Cats rarely fail without serious mechanical problems, I think your mechanic wants to give you an expensive repair bill. How to diagnose code P0420 on a Subaru Impreza. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced …As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).So my wife and I bought an '07 Outback Basic back in January, used with about 130k miles on it. MIL came on around 6 weeks ago with a P0420 code. Been doing a lot of googling/reading about P0420 codes lately- I've had several conversations with different mechanics around town, some helpful and some not, but someone suggested …Went to autozone, and got the P0420 code. I've ordered a new front O2 sensor from subarupartsforyou.com and will try a few other suggestions. But why would the CRUISE light be flashing and the cruise control system be inop as well? I've seen a previous thread where someone had that, but just the P0420 code was addressed.NinoS. 1104 posts · Joined 2014. #3 · Sep 8, 2020. I've used them before back when I put headers on my 03X - the fix works. You'll want to take a look at your 02 sensor and make sure you have space for a spacer (or maybe even if you can get it out), might need a 90 degree spacer (i'm not familiar with the SH forester).Has your check engine light recently turned on? Are you seeing the dreaded error code P0420 on your vehicle’s diagnostic scanner? Don’t panic just yet. Code P0420 is a common issue...Code P0420 Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc. P0420 is one of the more common trouble codes that we see.Desferal (Injectable) received an overall rating of 7 out of 10 stars from 1 reviews. See what others have said about Desferal (Injectable), including the effectiveness, ease of us...Front Pipe - 2013-2017 Subaru XV Crosstrek / 2012-2016 Impreza Wagon. Increased ground clearance! Increased exhaust flow! Don't get stranded with a failed factory catalytic converter on your Crosstrek XV or Impreza. Rockauto shows a bunch in …P0420 code is the rear sensor reading the O2 levels coming out of the cat are higher than what should be. (possible failing Cat) good sensor. P0136 is the computer reading a problem with the sensor. Just did a PO136 on a ladies 2001 Forester. Changed rear sensor for $124 for part from Subaru and 20 minutes labor.In this video I am working on a 2014 Subaru Outback with a 2.5 and CVT. We have done quite a bit of work to this car to solve an ongoing P0420 code. Make su...Eight hours a day is way too much at some Swedish companies. By clicking "TRY IT", I agree to receive newsletters and promotions from Money and its partners. I agree to Money's Ter...My '11 (140k miles) has been throwing a P0420 code along with running a bit rough, it stalls from a start (oddly the autostart has no issues keeping it running), and I'd say I'm down to about 70% power overall. The dash is lit up like a Christmas tree with the cruise flashing and two vehicle dynamics lights on.How to diagnose code P0420 on a Subaru Outback. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust flow ...Also, P0420 can be the cat, but it can be a number of other things including rear O2 sensor, intake/exhaust leak messing with the air fuel ratio, spark plugs, fuel ...If you are a car owner, it is likely that you have encountered the dreaded check engine light at some point. One of the most common trouble codes that many drivers come across is c...Subaru WRX P0420 OBDII Code Defined. P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. Here’s the technical … Here's an Amazon link to that impact gun → http://www.amazon.com/gp/product/B00BWFIKZO/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASI... Visit me at: http://www.ericthecarguy.com/O2 Sensor Video: https://www.youtube.com/watch?v=NIzcztO-CCsDiscussion about this video: http://www.ericthecarguy...The OBD2 code P0420 is stored in memory when the PCM detects a low efficiency in the catalyst system. What symptoms may occur with this OBD II code? Usually, the only symptom is the CEL lit. The Check Engine Light will turn on after few driving cycles to alert the driver about the situation. But under some circumstances, the CEL will blink ...Ran my OBD2 scanner and turns out I have a catalytic converter code failing code (P0420). I remember this happening to me about 4-5 years ago but all I did was clear the code and i’m pretty sure it never came back until very recently. ... /r/WRX is a place for Subaru fanatics to show off their rides, discuss modifications, mechanical issues ...Ah the classic Subaru P0420. So are parts required to fix this pesky emissions code? In this case we get a good example of where the "money light" gets its n...8 posts · Joined 2019. #1 · Aug 25, 2019. Hey guys I just picked up my 04 Forester a few weeks ago as my first car and I love the car so much already but I recently just had my Check Engine Light pop up. Ran the code and got " P0420 - Catalyst System Efficiency Below Threshold Bank 1". I did some research and I'm pretty positive one of my o2 ...The Federal Reserve Bank of St. Louis president helped spur a plunge below the opening print and to the day's lows....IWM For several weeks the market has been rallying on news...J. Jdave Discussion starter. 7 posts · Joined 2017. #11 · Sep 11, 2019. A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for (unlikely) A damaged or failed oxygen / O2 sensor Downstream oxygen sensor (HO2S) wiring damaged or connected improperly.EATON VANCE GEORGIA MUNICIPAL INCOME FUND CLASS A- Performance charts including intraday, historical charts and prices and keydata. Indices Commodities Currencies StocksHow to diagnose code P0420 on a Subaru Outback. Typically, you'll find out about P0420 because your malfunction indicator lamp or "check engine light" turned on & you or a mechanic diagnosed the problem with an OBD II code scanner like this one from Bluedriver. You may experience a very slight reduction in engine power from reduced exhaust flow ...If you find a P0420 code in your Subaru or Honda, it’s most likely the catalytic converter to blame. It can also be caused by an exhaust leak or a bad oxygen sensor . Check for vacuum leaks or other fuel mixture-related engine codes.The OBD2 code P0420 is stored in memory when the PCM detects a low efficiency in the catalyst system. What symptoms may occur with this OBD II code? Usually, the only symptom is the CEL lit. The Check Engine Light will turn on after few driving cycles to alert the driver about the situation. But under some circumstances, the CEL will blink ...59 posts · Joined 2015. #1 · May 23, 2020. I'd greatly appreciate some help troubleshooting a P0420 code on my '07 OB. I've reviewed many posts on this, including the P0420 Diagnosis post on the Problems and Maintenance forum, but I'm not understanding some of the basics. Many of the posts refer to checking for exhaust leaks.Here are the most common causes of P0420 in the Subaru Impreza: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …Now, to effectively diagnose the issue with a P0420 using aftermarket software and determine where the problem lies, and we will use RomRaider since it is widely used by Subaru owners for various reasons, log the data from the rear O2 sensor.The numbers: Ugly, as expected. Credit Suisse reported a second-quarter loss of 700 million Swiss francs ($779 million), its worst quarterly result since the depths of the financia...Mar 25, 2010 · One of my favorite threads for this is the $5 fix :wink: When you get the P0420 CEL code, the cause can be: A faulty or failing front O2 sensor (if your gas mileage has dropped off with hesitation, backfires & an overly sooty exhaust tip). An exhaust air leak ahead of the rear O2 sensor (rusted or cracked pipe). A failed CAT. This is a very common Subaru code. It ranges from seemingly "unfixable" (i.e., reflash the ECU to ignore it), catalytic converter replacement, rear O2 sensor, exhaust leak, all kinds of stuff. I wouldn't worry too much unless other symptoms/codes appear. My car throws a P0420 about every 1000-2000 miles (edit: and still gets high 20's average ...Hello everyone! Received this p0028 code on my 08 ll bean forester last weekend when going up to the mountain. Didn’t notice any issue running until I had to climb a pretty steep hill and rpms went over 4K. The car was physically shaking back and forth like it was going to stall until I took my foot off the gas a bit and brought rpms down.There is a thread on this forum with over 3,000 posts that deals specifically with the P0420 code. The main thing to know is that this code DOES NOT mean the CAT needs replacing. The next thing to know is that the O2 sensors need to be genuine Subaru or Denso brand as other sensors such as Bosch react too slowly for the ECU.Aug 18, 2023 · Tech Notes. As the code description implies, the P0420 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory expects). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way Catalyst ... One of my favorite threads for this is the $5 fix :wink: When you get the P0420 CEL code, the cause can be: A faulty or failing front O2 sensor (if your gas mileage has dropped off with hesitation, backfires & an overly sooty exhaust tip). An exhaust air leak ahead of the rear O2 sensor (rusted or cracked pipe). A failed CAT.Individual retirement accounts offer significant tax benefits to help boost retirement savings. While you may be tempted to withdraw money from your account before you retire, trea...The P0420 engine code indicates the catalyst system efficiency is below the threshold (Bank 1). A P0420 code indicates a problem with the catalytic converter, more specifically. The purpose of the catalytic converter is to break down harmful pollutants created during the combustion cycle. By using fine platinum and gold meshes to filter exhaust ...Nov 19, 2017 · Causing bad readings which throws a code telling you that you need a new cat or O2 sensor. Start up front and move your way to the exhaust. Hey Tyler, air filter is stock, I haven’t changed it yet, I’ll check right when I get off work. 11-16-2017, 10:15 AM. # 6. gn4rwhals vbmenu_register ("postmenu_45422896", true); Desferal (Injectable) received an overall rating of 7 out of 10 stars from 1 reviews. See what others have said about Desferal (Injectable), including the effectiveness, ease of us...Bluedriver diagnostic tool: https://amzn.to/2Vk2XjjO2 sensor socket: https://amzn.to/2TexLPPFixing the P0420 code is easy. First, make sure you're all cau...It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc. P0420 is one of the more common trouble codes that we see. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc. P0420 is one of the more common trouble codes that we see. Here are the most common causes of P0420 in the Subaru Legacy: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …Dec 4, 2023 · 2010 outback2.5 code p0420. Hi all! Last night after hitting a rough patch of road on the highway most of my dash lights lit up. Cruise and E brake light blinking, check engine and traction came on too. I took it to autozone just to get the code and p0420 Bank 1 came up in the test results. Conclusion. The P0420 code is an indicator of a problem with the catalytic converter in your Subaru. Common causes can include failed or malfunctioning components, such as the oxygen sensor, fuel system, EGR system, and exhaust system. It's best to take your vehicle to a professional mechanic for diagnosis and repairs.2013 Outback P0420 code. Hello, I am new to this forum and Subarus meaning that this is my first Subaru and first post. Thanks for all the great information. I currently have a P0420 code and am trying to determine the issue. I have a 2013 Outback with 121k miles which I bought back in March 2017. There were lean codes which were due to some ...The Barclays Gap credit card family recently launched. Here's why old cardholders and potentially new ones should look focus on the changes. Increased Offer! Hilton No Annual Fee 7...This week Dana is working on correcting the issue of Code P0420, a Bad Catalytic Converter. We started this project off with a Dorman aftermarket catalytic c...There is a thread on this forum with over 3,000 posts that deals specifically with the P0420 code. The main thing to know is that this code DOES NOT mean the CAT needs replacing. The next thing to know is that the O2 sensors need to be genuine Subaru or Denso brand as other sensors such as Bosch react too slowly for the ECU.Jul 9, 2014 · 21417 posts · Joined 2006. #5 · Jul 10, 2014. However, when the light is cleared, while using the cruise control there is a slight hesitation present ONLY while the cruise is being used. There is no hesitation or issue present otherwise. It's possible that the P0420 and the hesitation are related, and that the hesitation is more noticeable ... 104 posts · Joined 2008. #2 · Oct 3, 2011. I as well have been dealing with the P0420 and a local subie dealer out here mentioned basically to clear the code and see how long it takes for it to come back up. Meanwhile, run fuel cleaner through the system to clear up the injectors and the 02 sensors. You said your putting the anti-foulers on ...Front Pipe - 2013-2017 Subaru XV Crosstrek / 2012-2016 Impreza Wagon. Increased ground clearance! Increased exhaust flow! Don't get stranded with a failed factory catalytic converter on your Crosstrek XV or Impreza. Rockauto shows a bunch in …The CEL would turn on and off occasionally so I changed the Wires, Plugs and coil pack and went ahead and did the 2 - O2 Sensors. Now over time I have earned 2 additional codes for my efforts. I have all three, (P0301, (Cylinder 1 Misfire Detected), P0303, (Cylinder 3 Misfire Detected), & P0420, (Catalyst System Efficiency Below …The most common fix for P0420 in the Subaru Baja is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Baja into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Subaru Baja: 1. Check for Other Codes.Air can and does enter cracks or small holes in the exhaust. A system in good shape does not have measurable pressure in it. The exhaust flowing through the pipe can draw ambient air in through openings. A partially blocked converter won't necessarily throw a P0420 code if it is still working as a catalyst.The most common fix for P0420 in the Subaru WRX is a new catalytic converter, followed by an O2 sensor replacement. Before taking your WRX into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Subaru WRX: 1. Check for Other Codes.P0420. I have a 2004 Legacy 2.5 California spec (3 cats, 5 O2 sensors) with a recurring p0420 pending code on bank 1 that keeps popping up on my blue driver for the past 2000 miles. The cats were replaced under warranty about 8-9 years, 100,000 miles ago. The Oxygen sensors are all original, so they have 167,000 miles on them.Subaru code P0420 refers to a diagnostic trouble code that indicates an issue with the catalytic converter in a Subaru vehicle. It means that there is a …How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av...M. mudd123 Discussion starter. 15 posts · Joined 2014. #1 · Feb 5, 2015. My 2003 OB w/ 2.5 135k developed P0420 code back in August. I have been playing around with it for awhile trying to figure it out. Here is the background on what took place: The CEL came on on a HOT and HUMID day while going about 60 mph, and about 1/8 of a tank …Even slight variations in the air/fuel mixture will cause the converter temperature to rise significantly. The “Catalytic Converter Efficiency” Diagnostic Trouble Codes (DTCs) P0420 and P0430, are among the top 10 DTCs technicians face. And while the description might imply a failed converter, odds are the ultimate fault lies somewhere …Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. A P0420 due to an oil filter is unheard of. More than likely the P0420 was intermittent and was going to go out and come back at some point no matter what you did. H6 OBW VDC, H6 OB Sedan, Tribeca, Lifted XT6. traildogck.The performance of the catalytic converter starts with air, fuel and fire. Your engine performance determines the function of the cat and is the number 1 reason the P0420 pops up. That's why the code states "Catalyst Efficiency Below Threshold" and not "Catalyst Failure". Yours is MAF metered air, so I'm going to give you an example of how you ...Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. A P0420 due to an oil filter is unheard of. More than likely the P0420 was intermittent and was going to go out and come back at some point no matter what you did. H6 OBW VDC, H6 OB Sedan, Tribeca, Lifted XT6. traildogck.Tech Notes. As the code description implies, the P0420 code means that the vehicle's Engine Control Module (ECM) has detected that the Three-way Catalyst Converter is not working properly (it is not as efficient as the factory expects). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the Three-way Catalyst ...The most common fix for P0420 in the Subaru Legacy is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Legacy into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Subaru Legacy: 1. Check for Other Codes.Subaru’s Lineartronic CVT design uses a chain rather than a cable to join the two pulleys of the CVT system as in most other CVT designs.P0420: význam, příčiny, opravy. Význam kódu P0420. Chybový kód P0420 indikuje, že katalyzátor nepracuje účinně, a obvykle i to, že je nutné ho vyměnit. Pokud se objeví, nutné bude provést diagnostiku motoru, a diagnostiku systému vstřikování paliva, zapalování, a výfukového systému. Příčiny P0420.Honestly, I think Subaru uses the P0420 to increase dealer repair traffic. If you're in a DIY mood, do a citrus clean on your cat. It's bolt-off, bolt-on. If you leave the rear O2 sensor in place, it will get a cleaning as well. If that doesn't do the trick, at least you've got the fasteners loosened for a replacement.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code SUBARU P0457 Saving Repa...The OBD2 code P0420 is stored in memory when the PCM detects a low efficiency in the catalyst system. What symptoms may occur with this OBD II code? Usually, the only symptom is the CEL lit. The Check Engine Light will turn on after few driving cycles to alert the driver about the situation. But under some circumstances, the CEL will blink ...Podcast episode breaking down myths about ADHD in both adults and children (Attention Deficit Hyperactivity Disorder) For some, ADHD is a debilitating disorder. For others, it’s se...8 posts · Joined 2019. #1 · Aug 25, 2019. Hey guys I just picked up my 04 Forester a few weeks ago as my first car and I love the car so much already but I recently just had my Check Engine Light pop up. Ran the code and got " P0420 - Catalyst System Efficiency Below Threshold Bank 1". I did some research and I'm pretty positive one of my o2 ...Here are the most common causes of P0420 in the Subaru Forester: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 …May 23, 2011 · P0420 is VERY RARELY a failing cat. It is most commonly a failing oxygen sensor (front Subaru, rear any brand), vacuum leak, exhaust leak or what not. Search that code on the forums and you'll find plenty of info. Cats rarely fail without serious mechanical problems, I think your mechanic wants to give you an expensive repair bill.
2013 Outback P0420 code. Hello, I am new to this forum and Subarus meaning that this is my first Subaru and first post. Thanks for all the great information. I currently have a P0420 code and am trying to determine the issue. I have a 2013 Outback with 121k miles which I bought back in March 2017. There were lean codes which were …. Mccoys bryan
The six business groups of Alibaba are Cloud Intelligence Group, Taobao Tmall Commerce Group, Local Services Group, Cainiao Smart Logistics, Global Digital Commerce Group, and Digi...2009 Subaru Outback P0420. It was diving awesome with no sign of issue when I got a CEL and my cruise and stability control lights came on and the systems disabled. This happened on the way home from purchasing the car. No sign of issues on my test drive Tested the code and it showed P0420.Nov 30, 2018 · The most common fix for P0420 in the Subaru Impreza is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Impreza into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Subaru Impreza: 1. Check for Other Codes. Mar 13, 2023 · OBD II fault code P0420 is a generic code that is defined as “Catalyst System Efficiency Below Threshold (Bank 1)”, and is set when the PCM (Powertrain Control Module) detects a condition that indicates that the catalytic converter on Bank 1 is operating below the minimum allowable efficiency threshold. Note that on engines with two banks ... The Federal Reserve Bank of St. Louis president helped spur a plunge below the opening print and to the day's lows....IWM For several weeks the market has been rallying on news...Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check engine light and pass an emissions test.The P0420 code is thr...The codes are: P0420: Catalyst System Efficiency Below Threshold (bank 1) P0422: EVAP Control System Leak Detected (Small Leak) I am now in a new area and went to a mechanic who wasn't familiar with my vehicle history. I explained my situation and mentioned to Rear O2 sensor issue of the past. This mechanic read the codes and said …The most common fix for P0420 in the Subaru Baja is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Baja into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Subaru Baja: 1. Check for Other Codes.Today we have a 2011 Subaru Outback with 174,000 miles. The check engine light is currently on and showing P0420. Does the catalytic converter need replaceme...Oct 22, 2023 · 2012 Forester 2.5X Manual 5spd - 142,309 miles. I bought the car in July 2021 with 116,000 miles. About 8/10 months ago or so, a P0420 code popped up, I did nothing about it for awhile since the car seemed to be running fine. Then a few months ago the car stalled as I was exiting the highway approaching the stop light at the end of the exit ramp. Code P0420 Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.Subaru Liberty P0420 OBDII Code Defined. P0420 is a OBDII trouble code. The code technically stands for: Catalyst System Efficiency Below Threshold. Your Liberty has at least two oxygen sensors, one before and after the catalytic converter. Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and ...I have the dreaded P0420 code. It is intermittent. Base engine. No turbo. Just purchased this 2006 outback with 145k miles. Has a brand new cat and new front 02 sensor. ... Subaru runs a wideband O2 in the front. The 0-1v readout that most other cars have, does not apply to Subaru. The rear O2s are the standard 0-1v units..
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